Coil choices for my truck?

If you are actually running GM style HEI and not some chinese import "ready to run" (I don't know about them) The GM HEI modules seem to be very un-particular about coils. Several E coils are run by many, as an experiment I just ran the stock old beat up Mopar coil on my 67. It produces noticeably stronger spark, and doesn't seem to hurt either the module or the coil